Undefined method `image_will_change!' for CarrierWave on Heroku

Question

I have a simple model that mounts a Carrierwave uploader. Everything works fine in development, but I get an undefined method "image_will_change!" error on heroku.

class Receipt < ActiveRecord::Base
  mount_uploader :image, ImageUploader
end

class ImageUploader < CarrierWave::Uploader::Base
  storage :fog
  def store_dir
    "receipts/saved"
  end
end

I have the cache_dir set appropriately as well according to the Carrierwave Wiki.

receipt.image = File.open "public/images/test.jpg" #works fine in development, fails in heroku

I ran into the same error message, and even though I did rake db:migrate, the error still didn't go away. So I ended up upgrading to the new Cedar stack, and it worked. I suspect though if I dropped the database, and redo the entire migration, it would have worked as well. — sivabudh, Aug 21 '11 at 04:25

score 145 · Accepted Answer · answered Mar 30 '11 at 16:43

145

It's likely that your db on heroku doesn't have the image column in the receipts table.

answered Mar 30 '11 at 16:43

Jack Dempsey

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That worked! I forgot I modified a migration to include this string. – Sean Coleman Mar 30 '11 at 20:42
5

And, if you get an error like this when you're running rspec tests, you may have forgotten to run ```rake db:test:prepare```. – Javid Jamae Aug 04 '13 at 21:56

score 19 · Answer 2 · answered Apr 26 '13 at 19:05

19

Even after running the migration on heroku, the error persisted.

I found that a heroku restart command was required to vanquish the error forever.

heroku restart

answered Apr 26 '13 at 19:05

philip_kobernik

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Just wanted to let you know that you saved my life. I was *this* close to leaping from my office window in frustration before I found this. – vlasits Jun 10 '13 at 18:09
Wow! Found this after 30 mins of searching ! Worked for me! – newbie Nov 20 '14 at 01:09

score 7 · Answer 3 · answered Mar 08 '13 at 13:47

7

It's probably because you forgot to run:

rake db:migrate

answered Mar 08 '13 at 13:47

Eduardo Santana

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Undefined method `image_will_change!' for CarrierWave on Heroku

3 Answers3

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